20021221110 has 64 divisors (see below), whose sum is σ = 52433464320. Its totient is φ = 4852308480.

The previous prime is 20021221109. The next prime is 20021221127. The reversal of 20021221110 is 1112212002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1815774 + ... + 1826766.

It is an arithmetic number, because the mean of its divisors is an integer number (819272880).

Almost surely, 2^20021221110 is an apocalyptic number.

20021221110 is an abundant number, since it is smaller than the sum of its proper divisors (32412243210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20021221110 is a wasteful number, since it uses less digits than its factorization.

20021221110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16533.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20021221110 its reverse (1112212002), we get a palindrome (21133433112).

The spelling of 20021221110 in words is "twenty billion, twenty-one million, two hundred twenty-one thousand, one hundred ten".